Abstract
The adsorption of C 2H 4 on supported Pt model catalysts is investigated with high resolution electron energy loss spectroscopy for the cases of Pt vapor deposited on an oxidized Al foil and a single crystal of TiO 2. At 160 K the HREELS spectra show evidence of the di-σ bonded ethylene species present on the supported Pt clusters, but upon warming to 325 K, only the TiO 2 supported model catalyst shows evidence of forming the ethylidyne species commonly seen on Pt(111) single crystals. The oxidized Al supported species begins to decompose by 250 K, and no spectra characteristic of ethylidyne has been seen. In the case of the TiO 2 supported model catalyst, we believe this is the first HREELS observation of ethylidyne on supported metal clusters.
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